Shouldn't construct_array_builtin and deconstruct_array_builtin agree on types?

Hi,

I noticed that these two function, introduced in d746021de18b, disagree
on what types they support. For construct_array_builtin, we support
these types:

- CHAROID:
- CSTRINGOID:
- FLOAT4OID:
- INT2OID:
- INT4OID:
- INT8OID:
- NAMEOID:
- OIDOID:
- REGTYPEOID:
- TEXTOID:
- TIDOID:

while deconstruct_array_builtin supports just a subset:

- CHAROID:
- CSTRINGOID:
- FLOAT8OID:
- INT2OID:
- OIDOID:
- TEXTOID:
- TIDOID:

I ran into this for INT4OID. Sure, I can just lookup the stuff and use
the regualr deconstruct_array, but the asymmetry seems a bit strange. Is
that intentional?

regards

--
Tomas Vondra
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